<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<input type="text" placeholder="姓名" id="i1">
<input type="text" placeholder="工资" id="i2">
<input type="text" placeholder="工作" id="i3">
<input type="button" value="添加" onclick="f()">
<table border="1">
  <caption>员工列表</caption>
  <tr>
    <th>姓名</th>
    <th>工资</th>
    <th>工作</th>
  </tr>
  <script>
    function f() {
      let tr = document.createElement("tr");
      let nameTd = document.createElement("td");
      let salTd = document.createElement("td");
      let jobTd = document.createElement("td");
      nameTd.innerText = i1.value;
      salTd.innerText = i2.value;
      jobTd.innerText = i3.value;
      tr.append(nameTd,salTd,jobTd);
      let table = document.querySelector("table");
      table.append(tr);
    }
  </script>
</table>

</body>
</html>